Connection to the amplifier Connect the Out of the phono amplifier to a line input (such as AUX, CD, Tuner, Tape or Video) on your amplifier. care to connect the left and right channels correctly. The right channel is usually marked red, the left channel black or white. ! Make all connections whilst the phono amplifier is disconnected from the power supply. Do not connect the phono amplifiers output to a phono input (sometimes labelled gram, disc or RIAA) on the amplifier.